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Author Topic: Crashing Ubuntu 14.10  (Read 2788 times)
Offline (Unknown gender) TacoBot
Posted on: February 20, 2015, 09:09:18 PM
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About 20% of the time, when I click "modify" in an object's menu, in order to add a new event, my entire system crashes and closes everything I have open without saving my work. Any help fixing this?
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Offline (Male) Josh @ Dreamland
Reply #1 Posted on: February 20, 2015, 11:23:06 PM

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That sounds like a JRE bug. What platform are you on? OpenJRE or Oracle JRE? What Java version?

It's a bit severe a bug to ask you to try to reproduce it, but if you can find consistent steps to do so, that would help. This is the first time I've heard of this issue.
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Offline (Unknown gender) TacoBot
Reply #2 Posted on: February 23, 2015, 01:39:01 AM
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I'm using OpenJRE/JDK. Here's the results of a java -version, in case that helps:

java version "1.7.0_75"
OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~utopic1)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)

I'll try to find consistent steps, but it seems pretty random so far...  ???
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Offline (Unknown gender) TacoBot
Reply #3 Posted on: February 24, 2015, 10:05:58 PM
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Alright. After messing around I can say for sure that these steps cause my system to crash:

1) Open an object
2) Click modify and open up the event selector
3) Close the event selector
4) Click modify again
5) Computer explodes in a plume of smoke and flames

If I close the object window and open it up again, I can use modify without incident.
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Offline (Male) Josh @ Dreamland
Reply #4 Posted on: February 24, 2015, 11:48:04 PM

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3) Close the event selector — The event selector is a tab that can't be closed. How are you closing it? Switching tabs or floating the tab and closing it does nothing for me. I can click "Modify" all day, no problem.
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"That is the single most cryptic piece of code I have ever seen." -Master PobbleWobble
"I disapprove of what you say, but I will defend to the death your right to say it." -Evelyn Beatrice Hall, Friends of Voltaire
Offline (Unknown gender) TacoBot
Reply #5 Posted on: February 25, 2015, 12:51:41 AM
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Now I'm even more confused...

This is what I'm talking about:
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Offline (Male) Josh @ Dreamland
Reply #6 Posted on: February 26, 2015, 11:53:01 PM

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Strange... The window opens as a tab for me, and closing it returns it to the tab pane. This is extra strange, because you are using the exact same OpenJDK build I am. Would you be willing to copy LGM somewhere it won't find ENIGMA, and verify that the problem persists without it? If no C++ code is involved, then this is an OpenJDK bug, and we'll need to file a ticket about it. This sort of thing has cropped up before; last time, using drag and drop at all after displaying a splash screen caused OpenJDK to crash the X window server. This time, your guess is as good as mine what might be causing this crash.

When it crashes, what does your system do? Does it black out, or just become completely unresponsive? Do the LEDs on your keyboard flash? Flashing LEDs indicate kernel panic, which theoretically shouldn't ever happen, and spells certain reboot. Otherwise, did you try switching to TTY1 (control-alt-f1) then back again (alt-f7)? Some minor X hiccups cause me to lose keyboard and/or mouse input until doing that. Can you move the mouse at all? Does anything on the system start consuming tons of memory? (If OpenJRE begins consuming more than 500MB of memory, that's another bug—Java processes are supposed to have limited memory).

Apologies for the 20 Questions. It'll help me to know exactly what's breaking (though it seems at this point that no LGM code can be causing it directly).
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"That is the single most cryptic piece of code I have ever seen." -Master PobbleWobble
"I disapprove of what you say, but I will defend to the death your right to say it." -Evelyn Beatrice Hall, Friends of Voltaire
Offline (Unknown gender) TacoBot
Reply #7 Posted on: March 01, 2015, 04:00:38 PM
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If I copy lateralgm.jar to another location and run it, the problem seems to go away.

After it crashes, my screen goes black for about 5 seconds, then it turns back on and I'm at the login screen. Once I log back in, all my programs are closed and my volume and brightness are back up to the maximum, as if I rebooted my machine.

None of my keyboard lights flash, and during the brief black screen, I can't switch th TTY1-6.
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Offline (Unknown gender) TheExDeus
Reply #8 Posted on: March 01, 2015, 05:21:39 PM

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I don't know how an application can crash that hard. Most OS doesn't allow the application to crash drivers or anything like that, so it's very baffling. Is there some kind of log or event (not familiar with ubuntu, I just know that on Windows a crash like that would write a driver crash event). LGM writes a .log in the same folder as the lgm itself. Maybe it writes the error as well.
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Offline (Unknown gender) TacoBot
Reply #9 Posted on: March 01, 2015, 07:40:42 PM
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There doesn't appear to be any log file in LGM's directory...  ???

I uploaded the system crash log here. There was about 20 MB of random garbage at the end of the file. I didn't think it was important so I didn't include it. (It probably would have broken pastebin, too.)
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Offline (Male) Josh @ Dreamland
Reply #10 Posted on: March 01, 2015, 11:02:34 PM

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Strange. It seems something LGM/OpenJDK is doing is aggravating a compiz bug, which I assume is a big part of how Unity operates, so Unity gives up the ghost and logs you out. I have no idea why running LGM without ENIGMA would solve this problem. I'll see if we can't reproduce this in a VM.
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"That is the single most cryptic piece of code I have ever seen." -Master PobbleWobble
"I disapprove of what you say, but I will defend to the death your right to say it." -Evelyn Beatrice Hall, Friends of Voltaire
Offline (Unknown gender) TacoBot
Reply #11 Posted on: March 05, 2015, 10:59:02 PM
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I think this is definitely a Java bug. I've been noticing Minecraft seems to crash my system the same way whenever I scroll with the mousewheel in menus instead of clicking and dragging the bar.

Maybe it's just my system. I hope not. That'd take years to fix...
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